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3 years ago

6

Estimate then record 721×8

2 answers:

Hitman42 [59]3 years ago

8 0

721*8= 5768.................

tia_tia [17]3 years ago

5 0

721❌8=5768 so that's the answer

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Hi plz help, if you can ill mark you 5 starz! :)

weqwewe [10]

Answer:

Step-by-step explanation:

Part A= 59.11

Part B: i think is B

I hope this helps :))

5 0

3 years ago

Read 2 more answers

Select one answer choice For part A and select one answer choice for part B

sweet [91]

$\bf \qquad \qquad \qquad \textit{discriminant of a quadratic} \\\\\\ \stackrel{\stackrel{a}{\downarrow }}{1}x^2\stackrel{\stackrel{b}{\downarrow }}{+6}x\stackrel{\stackrel{c}{\downarrow }}{+9}=0 ~~~~~~~~ \stackrel{discriminant}{b^2-4ac}= \begin{cases} 0&\textit{\underline{one real solution}}~~\textit{\Large \checkmark}\\ positive&\textit{two real solutions}\\ negative&\textit{no solution} \end{cases} \\\\\\ 6^2-4(1)(9)\implies 36-36\implies 0$

6 0

3 years ago

Choose the expanded form of this expression 4(1/4 a + b - 6)

zalisa [80]

Answer:

a+4b-24

Step-by-step explanation:

4(1/4a+b−6)

=(4)(1/4a+b+−6)

=(4)(1/4a)+(4)(b)+(4)(−6)

=a+4b−24

3 0

3 years ago

Use the distance formula to find the distance if point a is 3,4 and point b is 1,2

Fed [463]

Answer:

square root of 8

Step-by-step explanation:

3 0

3 years ago

Convert the Cartesian equation (x 2 + y 2)2 = 4(x 2 - y 2) to a polar equation.

SashulF [63]

<u>ANSWER</u>

${r}^{2} = 4 \cos2\theta$

<u>EXPLANATION</u>

The Cartesian equation is

${( {x}^{2} + {y}^{2} )}^{2} = 4( {x}^{2} - {y}^{2} )$

We substitute

$x = r \cos( \theta)$

$y = r \sin( \theta)$

and

${x}^{2} + {y}^{2} = {r}^{2}$

This implies that

${( {r}^{2} )}^{2} = 4(( { r \cos\theta) }^{2} - {(r \sin\theta) }^{2} )$

Let us evaluate the exponents to get:

${r}^{4} = 4({ {r}^{2} \cos^{2}\theta } - {r}^{2} \sin^{2}\theta)$

Factor the RHS to get:

${r}^{4} = 4{r}^{2} ({ \cos^{2}\theta } - \sin^{2}\theta)$

Divide through by r²

${r}^{2} = 4 ({ \cos^{2}\theta } - \sin^{2}\theta)$

Apply the double angle identity

$\cos^{2}\theta -\sin^{2}\theta= \cos(2 \theta)$

The polar equation then becomes:

${r}^{2} = 4 \cos2\theta$

7 0

3 years ago